Ocean uptake potential for carbon dioxide sequestration

For the assessment of the long-term consequences of the carbon dioxide ocean sequestration, the CO2 injection into the middle depth parts of the ocean was simulated using a geochemical box model of the global carbon cycle. The model consists of 19 reservoir boxes and includes all the essential processes in the global biogeochemical cycles, such as the ocean thermohaline circulation, the solubility pump, the biological pump, the alkalinity pump and the terrestrial ecosystem responses. The present study aims to reveal the effectiveness and consequences of the direct ocean CO2 sequestration in relation to both lowering the atmospheric transient PCO2 peak and reduction in future CO2 uptake potential of the ocean. We should note that the direct ocean injection of CO2 at the present time means the acceleration of the pH lowering in the middle ocean due to the eventual and inevitable increase of CO2 in the atmosphere, if the same amount of CO2 is added into the atmosphere-ocean system. The minimization of impact to the whole marine ecosystem might be attainable by the direct ocean CO2 sequestration through suppressing a decrease in the pH of the surface ocean rich in biota. The geochemical implication of the ocean sequestration is such that the maximum CO2 amount to invade into the ocean, i.e., the oceanic CO2 uptake potential integrated with time until the end of fossil fuel era, is only dependent on the atmospheric PCO2 value in the ultimate steady state, whether or not the CO2 is purposefully injected into the ocean; we gave the total potential capacity of the ocean for the CO2 sequestration is about 1600 GtC in the case of atmospheric steady state value (PCO2) of 550 ppmv.

[1]  E. Maier‐Reimer,et al.  Ocean-circulation model of the carbon cycle , 1990 .

[2]  Thomas F. Stocker,et al.  Influence of CO2 emission rates on the stability of the thermohaline circulation , 1997, Nature.

[3]  Andrew J. Weaver The Science of Climate Change , 2003 .

[4]  Y. Yamanaka,et al.  The role of the vertical fluxes of particulate organic matter and calcite in the oceanic carbon cycle: Studies using an ocean biogeochemical general circulation model , 1996 .

[5]  Yoshiyuki Nozaki,et al.  Feasibility of dumping fossil-fuel CO2 into the deep ocean , 1991 .

[6]  L. Anderson,et al.  Chemical-constituents of the arctic ocean in the svalbard area , 1981 .

[7]  R. Gifford Implications of CO2 Effects on Vegetation for the Global Carbon Budget , 1993 .

[8]  Takashi Kikkawa,et al.  Comparison of the lethal effect of CO2 and acidification on red sea bream (Pagrus major) during the early developmental stages. , 2004, Marine pollution bulletin.

[9]  Dwain F. Spencer,et al.  The capacity of the deep oceans to absorb carbon dioxide , 1993 .

[10]  V. Smetacek,et al.  Carbon dioxide limitation of marine phytoplankton growth rates , 1993, Nature.

[11]  Wallace S. Broecker,et al.  Atmospheric response to deep-sea injections of fossil-fuel carbon dioxide , 1979 .

[12]  R. Bacastow,et al.  Atmospheric carbon dioxide and radiocarbon in the natural carbon cycle: II. Changes from A. D. 1700 to 2070 as deduced from a geochemical model. , 1973, Brookhaven symposia in biology.

[13]  Abraham Lerman,et al.  BIOGEOCHEMICAL RESPONSES OF THE CARBON CYCLE TO NATURAL AND HUMAN PERTURBATIONS: PAST, PRESENT, AND FUTURE , 1999 .

[14]  T. Ohsumi,et al.  CO2 storage options in the deep sea , 1995 .

[15]  Tom M. L. Wigley,et al.  Balancing the carbon budget. Implications for projections of future carbon dioxide concentration changes , 1993 .

[16]  F. Mackenzie,et al.  Coastal-Zone Biogeochemical Dynamics under Global Warming , 2000 .

[17]  W. Schmitz On the interbasin‐scale thermohaline circulation , 1995 .

[18]  Biodiversity and biological impact of ocean disposal of carbon dioxide , 1998 .

[19]  R. Wanninkhof Relationship between wind speed and gas exchange over the ocean , 1992 .

[20]  Syukuro Manabe,et al.  Century-scale effects of increased atmospheric C02 on the ocean–atmosphere system , 1993, Nature.

[21]  Ulf Riebesell,et al.  Reduced calcification of marine plankton in response to increased atmospheric CO2 , 2000, Nature.

[22]  L. Merlivat,et al.  Air-Sea Gas Exchange Rates: Introduction and Synthesis , 1986 .

[23]  C. Marchetti On geoengineering and the CO2 problem , 1977 .

[24]  O. Klepper,et al.  A sensitivity study of the effect of global change on ocean carbon uptake , 1995 .

[25]  James C. G. Walker Numerical adventures with geochemical cycles , 1990 .

[26]  L. Merlivat,et al.  Seasonal variation of the CO2 exchange coefficient over the global ocean using satellite wind speed measurements , 1991 .

[27]  U. Siegenthaler,et al.  Atmospheric carbon dioxide and the ocean , 1993, Nature.

[28]  H. Rogner AN ASSESSMENT OF WORLD HYDROCARBON RESOURCES , 1997 .

[29]  S. Manabe,et al.  Transient response of a coupled model to estimated changes in greenhouse gas and sulfate concentrations , 1997 .

[30]  R. Weiss Carbon dioxide in water and seawater: the solubility of a non-ideal gas , 1974 .

[31]  M. Bender,et al.  Tracers in the Sea , 1984 .

[32]  J. Gordon,et al.  Molecular analysis of commensal host-microbial relationships in the intestine. , 2001, Science.

[33]  E. Maier‐Reimer,et al.  Dynamics of fossil fuel CO2 neutralization by marine CaCO3 , 1998 .